Part of the body needing some doctor’s opinion (5)
I believe the answer is:
torso
'part of the body' is the definition.
(a person's chest)
'some doctor's opinion' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TORSO' is hidden in the letters of 'doctors opinion'.
'needing' acts as a link.
(Other definitions for torso that I've seen before include "Trunk of human body" , "Roost (anag)" , "unfinished work" , "upper body" , "Main part of human body" .)